目录

方式1：splice（index,1）

方式2：new Set() .delete()

方式3：delete

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方式1：splice（index,1）

splice() 方法会直接对修改原数组

    let arr = ["vue", "react", "angular"];
    console.log("删除前arr：", arr);
    for (let i in arr) {
      if (arr[i] === "react") {
        let result = arr.splice(i, 1);
        console.log("删除值:", result);
      }
    }
    console.log("删除后arr:", arr);

方式2：new Set() .delete()

    let arr = ["vue", "react", "angular"];
    console.log("删除前arr：", arr);

    let setArr = new Set(arr);
    let result = setArr.delete("react");

    console.log("是否删除成功：", result);
    console.log("删除后arr:", Array.from(setArr));

方式3：delete

delete删除掉数组中的元素后，会把该下标出的值置为undefined,数组的长度不会变

    let arr = ["vue", "react", "angular"];
    console.log("删除前arr：", arr);

    let result = delete arr[1];

    console.log("是否删除成功：", result);
    console.log("arr[1]:", arr[1]);
    console.log("删除后arr:", arr);